Flow Over Notches and Weirs A notch is an opening in the side of a tank or reservoir which extends above the surface of the liquid. It is usually a device for. –As it has sharp edges, the flow over the notch is FRICTIONLESS (Ff=0). –these are generally used to measure small discharge across CANAL. WEIR: -These. The bottom edge, over which the liquid flows, is known as sill or crest of the notch and the sheet of liquid flowing over a notch (or a weir) is known as nappe or.
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Published by Alessandro Illes Modified over 3 years ago. It is usually a device for measuring discharge. A weir is a notch on a larger scale. It may be sharp crested but also may have a substantial width in the direction of flow – it is used as both a flow measuring device and a device to raise water levels.
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Weir Assumptions We will assume that the velocity of the fluid approaching the weir is small so that kinetic energy can be neglected. We will also assume that the velocity through any elemental strip depends only on the depth below the free surface.
These are acceptable assumptions for tanks with notches or reservoirs with weirs, but for flows where the velocity approaching the weir is substantial the kinetic energy must be taken into account e.
To make further use of this equation we need an expression relating the width of flow across the weir to the depth below notcjes free surface. The lift force on an aircraft is exerted by the air moving over the wing.
Flow Over Notches and Weirs
A jet of water from a hose exerts a force on whatever it hits. The momentum equation is a statement of Newton.
Consider the two dimensional system in the figure below: My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password?
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Notches and Weirs